Peter K. L. Ng's research while affiliated with New Mexico Museum of Natural History and Science and other places

Publications (995)

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The Thoracotremata is a large and successful group of “true” crabs (Decapoda, Brachyura, Eubrachyura) with a great diversity of lifestyles and well-known intertidal representatives. The group represents the largest brachyuran radiation into terrestrial and semi-terrestrial environments and comprises multiple lineages of obligate symbiotic species....
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The identity of the poorly known plagusiid crab Euchirograpsus polyodous (Stebbing, 1921) is clarified on the basis of a good series of specimens from Zanzibar. The species proves to be a senior synonym of Euchirograpsus madagascariensis Türkay, 1978. The species is characterized by the more elongate and rugose third maxillipeds, distinctly serrate...
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The taxonomy of the pinnotherid crab, Pinnotheres tivelae (Gordon, 1936), now assigned to Arcotheres Manning, 1993, is revised. Type specimens from Muscat, Gulf of Oman, are compared with extensive material from the type locality and Persian Gulf. Arcotheres tivelae is shown to be a valid species, is redescribed, figured to modern standards and mal...
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The brachyuran crab Pseudorhombila haswelli Miers, 1884, described on the basis of two juveniles from the Arafura Sea, is a poorly known species of uncertain systematic position. It was made the type and only species of Homoioplax Rathbun, 1914, and assigned to the Prionoplacinae (Goneplacidae). Subsequent revisions of the goneplacids showed Priono...
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In the present contribution, all of Heller’s new decapod genus- and species-group names are listed with their current identities. In total, Heller described 149 species-group taxa, of which 75 are currently still in use, as well as 16 genus-group taxa, eight of which are still in use today. A complete list of the Decapoda publications of Heller wit...
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The coconut crab, Birgus latro (Linnaeus, 1767), the largest land arthropod in the world, is widely distributed on islands and atolls across the Indian and Pacific Oceans, but there is strong evidence that populations are declining in the face of anthropogenic threats. Here we review the data on population trends, habitat availability, distribution...
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Xanthid crabs of the genus TweedieiaWard, 1935, are among the most beautiful decapod cryptofauna in Indo-West Pacific coral reefs, with an ornate arrangement of granules and setae, in combination with an eye-catching color pattern. The genus and three recognised species (T. odhneri (Gordon, 1934), T. laysani (Rathbun, 1906), and T. brevidactylaDai...
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The Zoological Survey of India, Western Regional Centre, Pune (ZSI-WRC) contains 1887 specimens of mostly unstudied marine brachyuran crabs. The present systematic study on the marine crabs of ZSI-WRC reports 62 species in 44 genera, 18 families and nine superfamilies. Of these, four genera and 13 species are new distributional records within India...
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A new hymenosomatid crab, Chartocinus rarus n. gen. n. sp., is described from coastal waters in western Papua (formerly Irian Jaya) in Indonesia. The new genus superficially resembles Amarinus Lucas, 1980, but can easily be distinguished by its subquadrate third maxillipeds with the merus produced along the anteroexternal edge, elongate ambulatory...
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The identity of Philyra alcocki Kemp, 1915 (Leucosiidae), a species described from Chilika Lake, India is clarified. The redescription of lectotype male and examination of fresh material collected from Chilika Lake, Odisha state of India revealed that P. alcocki is significantly different morphologically from members of Philyra senso stricto and ot...
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The hymenosomatid crab Neorhynchoplax devroyi sp. nov. is described here from West Bengal in eastern India. The species is most similar to N. demeloi Kemp, 1917, described from Cochin in western India, but can easily be distinguished by its proportionately longer and more slender ambulatory legs, truncate cutting teeth on the chelipeds, relatively...
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A new species of intertidal sesarmid crab, 𝘓𝘪𝘵𝘩𝘰𝘴𝘦𝘭𝘢𝘵𝘪𝘶𝘮 𝘵𝘢𝘯𝘵𝘪𝘤𝘩𝘰𝘥𝘰𝘬𝘪 new species, is described from the Gulf of Thailand. The species is superficially similar to 𝘓. 𝘬𝘶𝘴𝘶 Schubart, Liu & Ng, 2009, from Singapore and Malaysia, but differs in the proportions of the ambulatory legs and the structure of the male first gonopod.
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The systematics of four species of the homolodromiid genus Dicranodromia A. Milne-Edwards, 1880, from East Asia and the Philippines is reappraised: D. danielae Ng & McLay, 2005, D. doederleini Ortmann, 1892, D. karubar Guinot, 1993, and D. martini Guinot, 1995; and key characters such as the epistome, gonopods, and spermatheca are figured in detail...
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Tritodynamia nontjii n. sp. is described from Papua, Indonesia, and is distinguished from congeners by its proportionately broader carapace and relatively shorter ambulatory legs. The new species superficially resembles T. yeoi Naruse & Ng, 2010, from Singapore, in having the male first gonopod stout with the distal portion broad and curved, but th...
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The taxonomy of majid spider crabs collected from recent southwest Indian Ocean cruises belonging to Eurynome Leach, 1814, and allied genera is treated. Eurynome longimana Stimpson, 1857, long synonymised with the European E. aspera (Pennant, 1777), is here recognised as a distinct species. Stimpson’s (1857) species can be distinguished by the arma...
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The French carcinologist and oceanographer Alain Crosnier (1930–2021) had a most influential role in modern carcinology. This tribute reviews his contributions to organising oceanographic expeditions; expanding collections of specimens, particularly from the deep sea; and supporting international collaboration for taxonomic investigations of the ri...
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Two new species of the gecarcinucid freshwater crab genus Arachnothelphusa are described from the Malaysian state of Sarawak in Borneo; one from Lanjak-Entimau Wildlife Sanctuary and another from Bako National Park. Arachnothelphusa rimba n. sp. is distinctive in possessing very long legs and a male first gonopod which has a cylindrical proximal pa...
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The leucosiid crab Orientotlos iishibai Sakai, 1980 was described from one female collected off western Japan and had never been reported since. The species is now recorded from southwestern Taiwan for the first time, and is redescribed and figured at length. Although Sakai argued that Orientotlos Sakai, 1980, is closely related to Oreophorus Rüppe...
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A new species of majid crab, Sakaija amicitiae n. sp., is described from New Caledonia Exclusive Economic Zone, Vauban seamount and the Chesterfield Atolls. The species is superficially similar to S. japonica (Rathbun, 1932) and S. santo Ng & Richer de Forges, 2015, from Vanuatu. Specimens from New Caladonia previously referred to S. santo are now...
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A new genus and new species of potamid freshwater crab, Xestomon tacu, is described from Ta Kou mountain in southern Vietnam. The new genus is characterised by its transversely ovate and smooth carapace surface, the very low to undiscernible epigastric and postorbital cristae, complete absence of a flagellum on the third maxilliped, relatively shor...
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The pilumnoid Hoploxanthus cultripes Alcock, 1898, is currently recognized as a valid species in the genus Parapanope De Man, 1895 (Galenidae). The species, however, has never been figured, and the solitary type specimen from Karachi has never been studied since the original description. A re-examination of the holotype male in the Zoological Surve...
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The taxonomy of the pilumnoid genus ParapanopeDe Man, 1895 is revisited and two new species are recognised. With a better series of specimens, more differences between the type species, P. euagoraDe Man, 1895 (from Java), and the morphologically similar P. hextii (Alcock, 1898) (from India) are documented. Specimens previously identified as P. euag...
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A new genus and new species of xanthid crab, Mabui calculusn. gen., n. sp., are described from Okinawa Island, Ryukyu Islands, Japan. The new taxon is unique for Brachyura by having bilaterally asymmetrical male gonopods and female gonopores, with the particular reproductive structure always distinctly more developed on one side than in the other....
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The taxonomy of the poorly known pilumnid crab, Pseudolitochira integra (Miers, 1884), has been confused because the original description and figures of the type female have inaccuracies, and the specimen has not been examined in detail since the original publication. Consequently, numerous specimens from the Indo-West Pacific have been incorrectly...
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In the majority of species and genus names in Decapoda Crustacea, the author(s) of the name equate with the author(s) of the work. In a relatively small number of cases, however, the author(s) of the name are either a subset of the authors of the work or are not an author on the work-a phenomenon herein termed "innies". We demonstrate that these tw...
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A new species of semi-terrestrial crab of the genus Geosesarma (Sesarmidae) is described from a limestone cave in central Sarawak, Malaysian Borneo. Geosesarma sodalis sp. nov. is characterised by its quadrate carapace, absence of a flagellum on the exopod of the third maxilliped, presence of 10 or 11 sharp tubercles on the dactylus of the chela an...
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A new genus of freshwater crab, Rajathelphusa gen. nov., and two species, R. ala sp. nov. (type species) and R. muni sp. nov., are described from the Kerala part of the Western Ghats biodiversity hotspot, India. The new genus is superficially similar to Arcithelphusa and Cylindrotelphusa from the same hotspot, but can easily be distinguished by the...
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The identities of two species of shallow water Southeast Asian and southern Chinese leucosiid crabs Philyra fuliginosa Targioni-Tozzetti, 1877, and P. olivacea Rathbun, 1909, are clarified; and shown to be synonyms. A new genus, Ovilyra, is established for P. fuliginosa, and it is easily distinguished from Philyra s. str. as well as allied genera b...
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The poorly known majid genus Majella Ortmann, 1893, is revised. The genus was previously known only from one species, M. brevipes Ortmann, 1893, described from Japan and reported from east Africa. Majella brevipes is redescribed and figured in detail from the type and material from the type locality, Sagami Bay in Japan. This species is now restric...
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Tritodynamia bengalensis n. sp. is described on the basis of a male specimen dredged from the shallow coastal waters of West Bengal state, India. The new species is morphologically similar to T. bidentata Yang & Tang, 2005 and T. serratipes Anker & Ng, 2014, but can be distinguished by the carapace shape, dentition of the pollex, relative length of...
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The nomenclature of two ocypodid names, Cancer vocans minor Herbst, 1782 and Gelasimus caerulens Adams, 1847, is discussed, because their identities have remained unresolved. The former is identified with Gelasimus annulipes H. Milne Edwards, 1837, and the latter with Mesuca ( Latuca ) paradussumieri Bott, 1973. To conserve the current and widespre...
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Five species of pilumnid crabs assigned to Eurycarcinus A. Milne-Edwards, 1867, Heteropanope Stimpson, 1858, and Pilumnopeus A. Milne-Edwards, 1867, have been reported from India: E. orientalis A. Milne-Edwards, 1867, E. bengalensis Deb, 1999, H. glabra Stimpson, 1858, H. neolaevis Deb, 1995, and P. convexus (Maccagno, 1936). The identity of E. ben...
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A new genus and two new species of potamiscine freshwater crabs (Potamidae) are described from the Abor Hills in the Upper Siang District of Arunachal Pradesh State, northeastern India. Abormon gen. nov. is morphologically most similar to Pararanguna Dai and Chen, 1985, from Yunnan Province in China but can be differentiated by the setose dorsal su...
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The phylogeny of two heterogeneous Indo-West Pacific and African sesarmid genera, Chiromantes Gistel, 1848, and Pseudosesarma Serène & Soh, 1970, is investigated using morphological and molecular methods. The two genera look superficially very similar, lack stridulatory ridges and tubercles on the chela, and have previously been separated by the pr...
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The poorly known epialtid crab, Hyastenus pleione (Herbst, 1803), from the Indian Ocean is re-described on the basis of the type material. Large sized specimens of a similar looking species from China are here assigned to a new species. The new species differs from H. pleione in having fewer large granules on the carapace, a blunt distal angle of t...
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The raninid genus Cyrtorhina Monod, 1956, is revised and restricted to Cyrtorhina granulosa Monod, 1956, from West Africa. A new genus, Flaberhina, is established for C. balabacensis Serène, 1971 from the Philippines and New Caledonia. Despite their superficial similarities, the two genera can easily be separated by the structures of the carapace,...
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The taxonomy of the potamid freshwater crabs of the Johora tahanensis (Bott, 1966) species group (Potamoidea) is revised. Seven species are recognised, all from Peninsular Malaysia and southern Thailand, three of which are described as new. The three new species were previously identified as J. tahanensis but can be distinguished by characters of t...
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A new species of long-legged sesarmid crab of the Leptarma leptosoma (Hilgendorf, 1869) species-group is described from mangroves in southwestern India. In the general carapace features as well as in the proportions of the long ambulatory legs, L. biju n. sp. is most similar to L. gracilipes (Li, Rahayu & Ng, 2018), from eastern Indonesia and Papua...
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The pilumnid crab Pilumnopeus convexus (Maccagno, 1936), native to the Arabian Sea and western Indian Ocean, has been discovered among intertidal fouling communities along shores of Hong Kong. The species was first discovered in 2011 and is believed to have become established by around 2016. Material from local sites was compared with specimens fro...
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The Australian southern giant crab, Pseudocarcinus gigas (Lamarck, 1818), has traditionally been placed in the families Oziidae Dana, 1851 or Menippidae Ortmann, 1893 (superfamily Eriphioidea MacLeay, 1838). Previous genetic studies questioned the validity of this classification as the molecular markers placed it far from all eriphioid lineages. A...
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The identity of the potamid freshwater crab, Indochinamon manipurense (Alcock, 1909) from the state of Manipur in northeast India, is clarified based on an examination of the type specimens. The species is redescribed and a lectotype designated. Specimens from the same region previously referred to this species were compared to the types of I. mani...
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The taxonomy of the deep-water spider crabs of the genus Scyramathia A. Milne-Edwards, 1880, is revised and four extant species are recognised from the Atlantic and western Indian Ocean: S. carpenteri (Norman, in Thomson 1873) (type species), S. umbonata (Stimpson, 1871), S. hertwigi Doflein, in Chun 1900, and S. tenuipes sp. nov. Scyramathia tenui...
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A new genus and new species of pilumnid crab, Ericiolumnus symbioticus (Decapoda: Brachyura), is described from the sponge Callyspongia Duchassaing & Michelotti, 1864 (Porifera: Callyspongiidae) in reefs in Lombok, Indonesia. The new taxon is characterized, among several characters, by the unusual shape of the carapace, which possesses sharp antero...
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The pinnotherid crab, Pinnothera obesa Dana, 1852, was originally described on the basis of material from Fiji, but its taxonomic status has long been obscure because the original description and figures are too brief and schematic by modern standards and the types are also lost. Examination of newly collected material from Fiji revealed the presen...
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Three new Indo-West Pacific species of pinnotherid crabs are described, one each of Arcotheres, Buergeres and Nepinnotheres. Arcotheres pollus, described from Paway Island, Mergui Archipelago, is most similar to A. boninensis (Stimpson, 1858), A. pernicola (Bürger, 1895) and A. purpureus (Alcock, 1900), sharing a transversely ovate carapace and lon...
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The identity of the widely distributed mangrove and riverine sesarmid crab Sesarmops impressus (H. Milne Edwards, 1837) is clarified. The species has been reported from Madagascar to the South Pacific, but its taxonomy was previously confused. On the basis of morphological characters and available molecular evidence (using 16S rDNA and cytochrome o...
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The identity of Nepinnotheres vicajii (Chhapgar, 1957) (described as Pinnotheres vicajii) (Pinnotheridae), a pea crab associated with the bivalve Marcia recens (Holten, 1802), is clarified. On the basis of re-diagnosis of holotype male and freshly collected female specimens from its type locality, P. vicajii is now assigned to Arcotheres Manning, 1...
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The giant isopod genus Bathynomus A. Milne-Edwards, 1879, is recorded for the first time in Indonesian waters, from deep waters off southern Java in the Indian Ocean. Bathynomus raksasa sp. nov. is described and notes on juvenile specimens of an unidentified species found in the same locality are also provided. Bathynomus raksasa sp. nov. is charac...
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Here, we report the first occurrence of Trizocarcinus Rathbun, 1914 (Brachyura: Euryplacidae) from the South Atlantic (Brazil). Trizocarcinus tacitus Chace, 1940 was collected in the upper continental slope of the Potiguar Basin, northeastern Brazil. The new record expands by 3000 km the southern distribution of the species in the Western Atlantic.
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Based partly on a collection of homolid crabs captured from baited traps in deep waters off French Frigate Shoals, Northwest Hawaiian Islands, in October 2006, the Hawaiian species of the family Homolidae are reviewed. Known genera and species in the Hawaiian Islands now include two species of Homola (H. orientalis and H. dickinsoni), two species o...
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Captain Edward Belcher was instructed by the Lords of the Admiralty to conduct a Surveying Expedition of the various coasts and islands in the Eastern Seas using H.M.S. Samarang. During this voyage from 1843–1846, Assistant-Surgeon Arthur Adams, made a significant contribution to the collection of natural history specimens, and together with fellow...
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A new species of cavernicolous sesarmid crab is described from Vanuatu. Karstarma umbra sp. nov. belongs to a group of three species that has the chitinous distal part of the male first gonopod slender and elongate. The new species can easily be distinguished from K. balicum (from Bali, Indonesia) and K. loyalty (from Loyalty Islands) by its distin...
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The taxonomy of the Indo-West Pacific rhizopine genus Typhlocarcinops Rathbun, 1909 (Pilumnidae) is revised and 22 species are recognised. The identification of these small, soft sediment-dwelling crabs has been difficult because many of the types have never been figured and described to modern standards. The identity of the type species, T. canali...
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The genera Bresedium Serène and Soh, 1970 and Sesarmops Serène and Soh, 1970 are two closely related taxa inhabiting terrestrial or freshwater environments from the Indo-West Pacific. Based on morphological and molecular evidence, two new species from Taiwan, the Philippines and Indonesia are described in this study, viz. B. eurypleon n. sp. and S....
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Telphusa austeniana Wood-Mason, 1871 is a poorly known potamid crab described from a single female specimen from Meghalaya state, northeastern India, and its position in Tiwaripotamon Bott, 1970 has been questioned. Its systematic position is now clarified based on the examination of the female holotype and a male specimen recently collected from a...
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The systematics of the arboreal sesarmid crab genera Labuanium Serène and Soh, 1970 and Scandarma Schubart, Liu and Cuesta, 2003 is revised. Also included is the poorly known genus Namlacium Serène and Soh, 1970, which is morphologically similar to Labuanium and may also be arboreal in habit. The present study restricts Labuanium to its type specie...
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The podotreme brachyuran subfamily Cyrtorhinae was established by Guinot (1993) for Cyrtorhina Monod, 1956, an unusual raninid genus from the Atlantic and Western Pacific. Although the family-group name has been accepted and used widely, it is not available for nomenclatural purposes. The present note serves to validate the name Cyrtorhininae.
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Mursia spiridonovi Karasawa, 2018 known only from the western Indian Ocean, is the smallest species of the genus, measuring only 18 mm in carapace length. The species is redescribed from fresh material collected in Tamil Nadu in southern India. It is compared with similarly sized specimens of M. bicristimana Alcock and Anderson, 1894, all of which...
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Three new coastal crabs, Parasesarma aurifrons n. sp., P. sanguimanus n. sp. and P. gemmatum n. sp. (Sesarmidae), are described from Taiwan and the Philippines. Parasesarma aurifrons is morphologically similar to P. ungulatum (H. Milne Edwards, 1853), P. liho Koller, Liu & Schubart, 2010, and P. obliquefrons (Rathbun, 1924); P. sanguimanus most clo...
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The identity of Arcotheres pernicola (Bürger, 1895) (Pinnotheridae), a pea crab supposedly associated with the mussel Perna, has been unclear as the type specimen is in poor condition. Specimens collected from the oyster Magallana gryphoides (Schlotheim, 1820) from Alibaugh, Maharashtra state, India, are here referred to A. pernicola and the specie...
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Two species of xenophthalmid crabs are recorded from the state of Maharashtra in northwestern India. Xenophthalmus garthii Sankarankutty, 1969, originally described from northern Kerala in India, is rediscovered, and the species proves to be a member of Anomalifrons Rathbun, 1931, a genus not previously known from the Indian Ocean. The taxonomy of...
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The poorly known sesarmid crab Sesarma (Holometopus) tangi Rathbun, 1931 was described from one male from Fujian, China, and was transferred to Neosarmatium Serène & Soh, 1970 by Schubart & Ng (2002). The collection of a good series of fresh specimens from near the type locality and Hong Kong allows us to reappraise its taxonomy. The new material s...
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The rare raninid crab Umalia trirufomaculata (Davie and Short, 1989) is recorded from India for the first time. It is redescribed and compared at length with the related but poorly known U. misakiensis (Sakai, 1937) on the basis of a good series of specimens from the Philippines. Some of the supposed differences which have been documented between t...
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This paper records two deep water brachyuran species, Naxioides robillardi (Miers, 1882) (Epialtidae) and Lupocyclus tugelae Barnard, 1950 (Portunidae) from India. The spider crab N. robillardi and the swimming crab L. tugelae both have wide distributions, occurring from East Africa to Japan and Australia. The present study records the occurrence o...
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A new species of the aberrant monotypic genus Planotergum Balss, 1935 (Brachyura: Majidae: Planoterginae) is described from the southern part of the Red Sea, based on a single female recently found in the collection of the Zoological Museum of Moscow State University. The new species is clearly distinguished from Planotergum mirabile Balss, 1935 in...
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The taxonomy of two species of secondary freshwater crabs endemic to Palau is discussed. Males of the chasmocarcinid Australocarcinus palauensis Davie & Guinot, 1996 (Trogloplacinae), previously known only from one female, are reported for the first time and the species is redescribed and figured. This species is closest to A. kanaka Davie & Guinot...
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Kasagia sudhakari, a new species of spider crab, is described from two male specimens from southeastern Arabian Sea. This species differs from its only congener Kasagia arbastoi Richer de Forges & Ng, 2007, from the Philippines in the shape and form of the carapace, shape of the pseudorostral spines, arrangement of the orbital plates (supraorbital...
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A new species of semi-terrestrial sesarmid crab of the genus Geosesarma De Man, 1892, is described from central Taiwan. Geosesarmamirumsp. nov. is distinct in possessing a strong transverse crest on the inner surface of the male chela and a diagnostic male first gonopod which is relatively long and stout, with the distal chitinous part broad and sp...
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The identity of the fiddler crab, Gelasimus variegatus Heller, 1862 (type locality: Madras, India), has long been uncertain. Examination of specimens from the Bay of Bengal shows that it is a valid species belonging to the genus Austruca Bott, 1973. Austruca variegata (Heller, 1862) can be separated from the closely related A. bengali (Crane, 1975)...